Question: The correct IUPAC name of $(\text{CH}_3)_3 \text{C} - \text{CH}_2\text{Br}$ is :

Step 1 (IUPAC Nomenclature Rules): [0.25 Mark]
According to IUPAC guidelines for naming haloalkanes, the longest carbon chain containing the principal functional group (halogen) must be selected as the parent alkane. Numbering must start from the end that gives the substituent the lowest possible locant.

Step 2 (Step-by-Step Structural Analysis): [0.5 Mark]
Expand the condensed structural formula to identify the longest chain:

• Longest Chain: The longest carbon chain containing the bromine atom consists of 3 carbons (Propane).
• Numbering: Numbering starts from the carbon attached to bromine as C1.
• Substituents: There are two methyl groups ($-\text{CH}_3$) attached to the C2 position.

Combining these: 1-bromo (position 1) + 2,2-dimethyl (position 2) + propane (parent chain).

Step 3 (Final Concluded Answer): [0.25 Mark]
The correct IUPAC name is 1-Bromo-2,2-dimethylpropane.

Correct Option: (D)

💡 EL10 Concept Insight: Think of the longest chain as the "main road" that must include the bromine "house." Since the longest path is 3 carbons long, we call it propane, and we just label the extra methyl "branches" and the bromine "signpost" by their positions on that road!